another attempt at a thread-safe array

array/iarray_free.c

@@ -1,9 +1,20 @@
 #include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
 #include "iarray.h"
 
+static void freechain(iarray_page* p,size_t pagesize) {
+  while (p) {
+    iarray_page* n=p->next;
+    munmap(p,pagesize);
+    p=n;
+  }
+}
+
 void iarray_free(iarray* ia) {
   size_t i;
-  for (i=0; i<ia->pagefence; ++i)
-    if (ia->pages[i]) free(ia->pages[i]);
-  free(ia->pages);
+  for (i=0; i<sizeof(ia->pages)/sizeof(ia->pages[0]); ++i) {
+    freechain(ia->pages[i],ia->bytesperpage);
+    ia->pages[i]=0;
+  }
 }